Update nixpkgs pins #2023

Job	Run time
cabal	10s
nix-build	42m 50s
unit-tests	4s
runghc	8s
build-extra-hackages	6s
cabal-doExactConfig	10s
docs	23s
hix	45s
maintainer-scripts	6s
multi-target	13s
plan-extra-hackages	5s
shellFor-hoogle	9s
shellFor-multiple-package	12s
shellFor-not-depends	13s
shellFor-single-package	14s
tests-benchmarks	12s
check-materialization-concurrency	19s
check-path-support	5s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	8s
hix-cabal	19s
hydra-ifdLevel-0-and-1	17s
hydra-ifdLevel-2	10s
hydra-ifdLevel-3-and-ghc-8-10	11s
hydra-ifdLevel-3-and-ghc-9-2	6s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	10s
hydra-without-remote-builders	2m 38s
nix-tools	11s
update-docs	8s
	50m 46s

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